Wrist and Hand Joint

Question 1

Major articulations at wrist & hand

Answer 1

-Radiocarpal: 80% of compressive force is transmitted to radial
-Mid-carpal Joint: medial/lateral compartment (lateral has less movement than medial)

Question 2

TFC and associated ligaments

Answer 2

-Triangular fibrocartilage complex
-Ligaments
1) Ulnar collateral ligament (UCL)
2) Palmar ulnocarpal ligament
3) Articular disc

Question 3

Central Column Model

Answer 3

-Center of rotation: base of capitate
-Central Column
1) 3rd Metacarpal
2)Capitate
3) Lunate
4) Radius

Question 4

Wrist-only extensors

Answer 4

1) Extensor carpi radialis longus
2) Extensor carpi radialis brevis
3) Extensor capri ulnaris

Question 5

Wrist-Finger extensors

Answer 5

1) Extensor digitorum
2) Extensor digit minimi

Question 6

Extensor retinaculum

Answer 6

-Forms individual compartments
- Prevents the underlying tendons from “bowstringing” up and away

Question 7

Wrist flexors

Answer 7

1) Flexor carpi radialis
2) Flexor carpi ulnaris
3)Palmaris longus

Question 8

Palmar Carpal Ligament

Answer 8

-Stabilize the wrist joint
-Similar function as the extensor retinaculum

Question 9

Thumb Movement

Answer 9

-Flexion and Extension
-Adduction and Abduction
-Opposition

Question 10

Intristic Muscles

Answer 10

(thenar + hypothenar muscles)